The latest numbers from research firm ComScore reveal the difficulties both Microsoft (MSFT) and Research in Motion (RIMM) face when deploying their new mobile operating systems. Windows Phone 8 handsets are just around the corner and the first BlackBerry 10 devices are slated to arrive for early next year, however it may be too late. In a three month period ending in September, ComScore found that Android and iOS were the only two operating systems to increase their market shares and have continued to dominate the mobile industry.

Google’s (GOOG) platform gained nearly one percentage point from June, controlling 52.5% of the United State smartphone market, while Apple’s (AAPL) operating system increased nearly two percentage points for a 34.3% share of the market. The BlackBerry platform continues to lose subscribers, falling more than two percentage points to 8.4%. Microsoft fared much better and its market share remained roughly unchanged from June, falling from 3.8% to 3.6%.

The research firm also found that smartphone penetration in the U.S. for the first time ever past the 50% threshold. For companies other than Samsung (005930) and Apple, however, the U.S. still remains a difficult market to break into.

Dan joins the BGR team as the Android Editor, covering all things relating to Google’s premiere operating system. His work has appeared on Fox News, Fox Business and Yahoo News, among other publications. When he isn’t testing the latest devices or apps, he can be found enjoying the sights and sounds of New York City.